I have tried to sell tokens in the past which resulted in losing all that I had, I need more advice on best Exchanges for mostly all altcoins and how safer they are to use?
What exactly do you mean by selling tokens that resulted in losing all of them? And which exchange were you using? So far, I have been using at least 4-5 exchanges and I have not encountered a similar problem. Is it really the exchange that has the problem? Or perhaps it is in your individual account? Please use 2FA and change your password regularly. You might want to try Bittrex, Cryptopia, Binance, KuCoin, HitBTC.